TUCSON — Tucson police say the final tally on guns turned in at a buyback event was 206.

Arizona residents will mark the two-year anniversary of the 2011 shooting of then-Rep. Gabrielle Giffords on Tuesday with bells ringing across Tucson amid a heated national debate over gun control.

Tucson residents lined up outside a police substation Tuesday morning to surrender guns in exchange for gift cards under a gun turn-in program organized by a City Council member, as gun-rights advocates mounted a counter effort to buy guns no longer wanted.

TUCSON — Former U.S. Rep. Gabrielle Giffords and her husband launched a political action committee aimed at curbing gun violence on Tuesday, the second anniversary of the Tucson shooting that killed six people and left her critically injured.

The Tucson and Flagstaff city councils voted Tuesday to sue Arizona over its tough new immigration law, citing concerns about enforcement costs and negative effects on the state's tourism industry.

TUCSON — The second anniversary of the rampage that wounded Gabrielle Giffords included the customary solemn remembrances and chiming of bells to recall the victims of the tragedy. It also included a new role for the wounded former congresswoman as a national gun control advocate.